42070861 has 6 divisors (see below), whose sum is σ = 48939630. Its totient is φ = 36060696.

The previous prime is 42070859. The next prime is 42070867. The reversal of 42070861 is 16807024.

42070861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 26977636 + 15093225 = 5194^2 + 3885^2 .

It is not a de Polignac number, because 42070861 - 2¹ = 42070859 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42070867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 429246 + ... + 429343.

It is an arithmetic number, because the mean of its divisors is an integer number (8156605).

Almost surely, 2^42070861 is an apocalyptic number.

It is an amenable number.

42070861 is a deficient number, since it is larger than the sum of its proper divisors (6868769).

42070861 is an equidigital number, since it uses as much as digits as its factorization.

42070861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 858603 (or 858596 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 42070861 is about 6486.2054392380. The cubic root of 42070861 is about 347.7980425276.

Adding to 42070861 its reverse (16807024), we get a palindrome (58877885).

The spelling of 42070861 in words is "forty-two million, seventy thousand, eight hundred sixty-one".